Question: When was ARD owned by Nordwestdeutscher Rundfunk?
Paraphrase: What was the timeline Nordwestdeutscher Rundfunk owned ARD ?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q49653 p:P127 ?s . ?s ps:P127 wd:Q446604 . ?s pq:P582 ?value}